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Celebrations and protests in Washington ahead of Donald Trump's inauguration

Donald Trump has arrived in Washington to begin celebrations before he takes the oath of office as the 45th US president tomorrow.

The 70-year-old president-elect travelled aboard an official government jet to a military base near Washington with his wife Melania.

The pair exited the plane today and headed into the nation's capital for a day of pre-inaugural festivities.

Mr Trump's public schedule for the inaugural celebration began at Arlington, where he and Mr Pence stood at attention at the Tomb of the Unknowns. It was a family affair, as Mr Trump's children and grandchildren silently looked on.

From there, Mr Trump head to a celebratory welcome concert on the steps of Lincoln Memorial that was to end with fireworks.

The two-hour concert, open to the public, featureed country star Toby Keith, soul singer Sam Moore, actor Jon Voight and The Piano Guys.

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It won't include singer Jennifer Holliday, originally announced as one of the headliners. She backed out after an outcry from Mr Trump's critics.

Meanwhile, A-list celebrities have joined several thousand protesters on the streets of New York to protest against Donald Trump on the eve of the incoming Republican president's inauguration.

Hollywood actors Robert de Niro and Alec Baldwin, Oscar-winning director Michael Moore and singer Cher were among those who joined the noisy gathering close to the Trump International Hotel on Central Park South.

Watch the US Presidential Inauguration LIVE this Saturday from 3am (AEDT) on 9NEWS, hosted by Karl Stefanovic in Washington DC.

The president-elect, who flew to Washington without any press on his plane, was joined on the trip by a gaggle of his children, grandchildren and other members of his extended family.

"It is a momentous day before a historic day," Vice President-elect Mike Pence said, as Washington put its finishing touches on the downtown area where hundreds of thousands of Americans will congregate for Trump's inauguration.

Meanwhile, A-list celebrities have joined several thousand protesters on the streets of New York to protest against Donald Trump on the eve of the incoming Republican president's inauguration.

Hollywood actors Robert de Niro and Alec Baldwin, Oscar-winning director Michael Moore and singer Cher were among those who joined the noisy gathering close to the Trump International Hotel on Central Park South.

Mr Trump's first stop was a luncheon in a ballroom at his own hotel, where he gave a shout-out to GOP congressional leaders, declaring: "I just want to let the world know we're doing very well together."

House Speaker Paul Ryan, he said, will finally have someone to sign legislation into law. Then Mr Trump veered into the territory of the unknowable to boast his Cabinet selections had "by far the highest IQ of any Cabinet ever."

Just blocks away, the White House was quickly emptying out.

Mr Obama's schedule was clear beyond his daily briefing and his final weekly lunch with Vice President Joe Biden.

He got in a few final official acts, though, cutting the sentences of 330 inmates and placing a call to German Chancellor Angela Merkel.

Mr Trump's swearing-in, on the steps of the Capitol at noon on Friday - a date and hour set by the US Constitution - will be carried live on screens around the globe.

Tens of thousands of Mr Trump supporters - and anti-Trump protesters - have converged on the capital for the democratic ritual.

Numerous dignitaries, including his unsuccessful Democratic rival for the presidency Hillary Clinton, and three former presidents will be in attendance.

Mr Trump is "very anxious to get to the White House and get to work for the American people," Mr Pence said, a 57-year-old Christian conservative who rose from being governor of Indiana to become the second most powerful person in the US government.

Mr Trump, a real estate magnate with no previous political or military experience, was elected in part for his abrasiveness: his working-class supporters have sent him to Washington to turn the page on the Obama era and upend the political status quo.

Mr Trump has vowed to act, and swiftly.

Mr Trump is expected to sign four or five decrees tomorrow, and then a raft of others beginning Monday to dismantle every policy he can without waiting for congressional approval: immigration, environment, energy and labor regulations are on the list.

He still has to finish writing his inaugural address. In December, at his Mar-a-Lago estate in Florida, he confided that he sought inspiration from John F. Kennedy and Ronald Reagan.

But spokesman Sean Spicer says the words will be Mr Trump's own, and last about 20 minutes, similar to Mr Obama's opening speech.

"It's going to be a very personal and sincere statement about his vision for the country," the incoming White House press secretary said as he hinted at the tone that the Republican billionaire will take.

"I think it's going to be less of an agenda and more of a philosophical document, a vision of where he sees the country, the proper role of government, the role of citizens."